ceramic topped pistons

[dmcclymont]

I am interested in knowing what success / failures anyone has had with ceramic topped pistons in a modified 2.4 merc carby engine on a tunnel boat.Any tricks or tips greatly appreciated. Thanks guys.

[YELLOWSS]

if you are talking about the wizards, they are not on the market yet.. they are getting real close though........ just have them for the2.5 245,260,280,drag...

[Jay Smith]

Wizards are NOT ceramic coated . The 2.4 pistons are being made NOW and will be available soon.. The Wizards are Racecote coated and work very well..As far as having a ceramic coating applied to the top of an existing piston I never have seen any advantage and some applications I've seen flake off with very little use. IMO it is a waste of money that could be spent elsewhere on your mods...

my .02

[dmcclymont]

thanks guys for your replies, the pistons with the ceramic tops are put out by PRO Marine, any clues.

[RNM018]

I am interested in knowing what success / failures anyone has had with ceramic topped pistons in a modified 2.4 merc carby engine on a tunnel boat.Any tricks or tips greatly appreciated. Thanks guys.

I ran a set for a couple of years in a modified 2.4 200 motor . I like them as I could get away with things that would have destroyed an uncoated piston The only rthing I had trouble with was figuring out the coolining system . They did not tranfer heat the same way as an uncoated piston and the motor was getting so hot you couldn't touch the block much less hold you hand in it . I finally pulled all the restriction out of it and was dumping two 3/8" waterlines from the heads with a poplet valve and that took care of it.Loved that motor and will do it again when I get a good suitable set of pistons again . Mine where done for me be a car motor builder in HollyWood Fl. . The shop is called "HEADS BY RICK " . I don't have any contact information for them ,but they shouldn't be to hard to find . These where Moly coated on the skirts and Ceramic coated on the domes . Good Luck ,and Have Fun ! Rich Martin 018

[Sam Baker]

We ran them pretty much exclusively in our OMC mod motors. We used Swaintech to ceramic coat the tops with their TBC Ceramic Thermal Barrier coating and Poly Moly the sides. Their ceramic expands with the piston so that helps with the flaking problems. We never saw any. Also their Poly Moly is unlike the traditional side coatings in that it doesn't wear off during break in - it stays on.

OMCs had a tendency to suffer from ignition issues so we had seen a lot of motors come in with holes in the tops of the pistons. The ceramic coating virtually stopped that.

I would definitely do it if I were running a modified 90 degree OMC with stock OMC ignition parts, but because the Mercury ignition is more dependable and consistent, I wouldn't think it's as necessary.

[Greg Moss]

The ceramic coating is to keep the heat in the combustion chamber. If you transfer heat from the combustion chamber in to the piston dome you lose efficiency. The less heat in the dome of the piston the better the motor will run and the less likely it is to detonate. Any real race engine builder knows the benefits of a ceramic coated piston.

[Jay Smith]

Its always great to get "opinions" from a "REAL" motor builder ..:rolleyes::D

[YELLOWSS]

i don't think he was asking what it did.. i think it was more about failure/success with them in a modified 2.4...JMO

[Rodney Nance]

A couple of things to remember is that when you reflect the heat off the top of the piston it has to go somewhere. Cylinder walls Heads Rings etc. Also a two stroke piston is not round until it comes up to temp. The Mercs seem to be a lot more sensitive to that than the OMC's. I have a very good ceramic that I use but for most hi. po. outboards I don't recommend it.